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推理能力是数学的核心能力之一.由于推理问题具有条件隐蔽、背景复杂、形式多样、头绪纷繁的特点,一直以来多被学生视为难题而敬而远之.事实上,此类问题的解决并非无章可循,本文试就推理问题的常见解法进行阐释.一、直接推理法直接推理法是直接从题设条件出发,经过细致的分析推理,排除掉不可能的情形,从而得出正确结论的一种推理方法.例1某月日期是偶数的星期天有三个,那么,这个月的15日是星期几?
Reasoning ability is one of the core competencies of mathematics.As reasoning has the characteristics of concealed conditions, complex background, diverse forms and numerous features, it has always been regarded by students as a problem and at arm’s length.In fact, the solution to such problems is not without problems This article attempts to explain the common solutions to inference problems.A direct reasoning method is based directly on the assumption that the conditions set out, through careful analysis and reasoning, to exclude the impossible, so as to draw the correct conclusion of a Kind of inference method.Example 1 There are three Sunday on an even date of the month, then, the 15th of this month is the day of the week?